Amplifier device for a condenser microphone

Details Amplifier device for a condenser microphone Amplifier device for a condenser microphone

1994-09-13

1996-11-26

Kuntz, Curtis

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

381120, H04R 300

Patent

active

055793975

ABSTRACT:
A common-source type buffer amplifier circuit has a microphone capsule, a diode and an FET. An output end of the buffer amplifier circuit, or a drain of the FET is connected to an input end of the current mirror circuit. An output end of the current mirror circuit is connected to one end of a load resistor of which the other end is grounded. A voltage across the load resistor corresponds to an output of the amplifier and is supplied to the speaker amplifier.

REFERENCES:
patent: 3512100 (1970-05-01), Killion et al.
patent: 4414433 (1983-11-01), Horie
Patent Abstracts of Japan, vol. 11, No. 277 (E-538) 8 Sep. 1987 & JP-A-62 076 907 (Toshiba Corp.) 9 Apr. 1987.
"Linear Applications vol. 1", Dec. 79, pp. 1-3.

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